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Preheat oven to 350.
In a bowl, add the melted butter and both sugars and mix until well combined.
Add the pumpkin puree, egg, egg yolk, and vanilla and mix well.
Add the flour, cinnamon, and baking soda and fold until no dry flour remains.
Fold in the oats.
Scoop about ¼ cup of dough per cookie to make 18 cookies.
Place on a lined baking sheet and bake for 10 minutes.
Allow the cookies to cool completely.
For the filling, add the softened butter, marshmallow fluff, and powdered sugar to a bowl and mix until light and fluffy.
Divide the filling evenly between 9 cookies and spread evenly.
Top each with another cookie and gently press together to make a sandwich.
Refrigerate for at least 1 hour before serving.